Stupid Elder Scrolls Online (PS4) question

[atryko]

This is probably a stupid question. But, I currently just have a copy of the vanilla ESO game. But, I'd like to buy the Morrowind disc, as it's on sale currently. Can I just use the Morrowind disc to play going forward? Or, will I need both discs?

Also, if I can just use the Morrowind disc...will I have to delete the original ESO, and reinstall the new Morrowind disc?